I use the compare files feature daily for my full-time job in publishing. Since the program has been updated beyond version 21.001.20155, it hasn't worked correctly.

Before the update, I was able to page through the documents seamlessly, flipping from page to page to make sure all corrections and insertions have been made in the newest PDF. It worked correctly, showing the same page from each document, side-by-side. For example, page 5 from the old file next to page 5 from the new file.

Now, since the update, the files rarely mirror one another. Instead, as I try to page through and review, only one PDF will flip from page to page. The other will stay stuck on, say, page 5. When I stop paging down, after a few moments, the lagging file will jump to the corresponding page. This makes the "compare files" feature useless.